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Hi Mike
1. Lulin is well past its best already, so it's getting fainter and harder to observe.
2. By "doubler" do you mean a 2x barlow? If you already have a 15mm and a 9mm, there's not too much point using a 2x barlow with the 15mm. The 9mm will most likely give a better view.
Depending on your range of eyepieces, barlows can be useful.
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